a theatre has 14 seats in the first row 21 seats in the second row 28 seats in the third row and so on how many seats are there in the ninth row if this pattern continues in the same manner
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a theatre has 14 seats in the first row 21 seats in the second row 28 seats in the third row and so on how many seats are there in the ninth row if this pattern continues in the same manner
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Answer:
First row=20, second row=24, third row=28
So, the A.P is 20,24,28
a=20
d=24−20=4
n=30
S
n
=
2
n
[2×a+(n−1)×d]
S
30
=
2
30
[2×20+(30−1)×4]
=15[40+29×4]
=15[156]
=2340
Total seats are 2340.
Answer:
First row =20 sec row =24 third row = 28
so, the A.P is 20,24,28
Total seats are 2340